I personally suggest hand washing.  I tried very hard to fade the image and was successful over several runs through the dishwasher.  Depending of heat, length of cycles, dryers, ect.  These will release the dye regardless of what my product supplier says.  Just like any item your own.  If you care for it, it will last longer.

Material: These sublimation mugs is made of high quality ceramic, BPA free, non-toxic, which offers greater temperature resistance for long-lasting use. Freezer and microwave safe

Quality Coating: Our sublimation cups are coated with high quality sublimation coating which achieves bright, white coated surface and high-density colors that will not washed off even by dishwasher.

Easy To Clean: The straight side and the wide mouth of the tazas para sublimacion allows easy accessibility to the bottom of the mugs for an easy and thorough cleaning by no matter dishwasher or hand with a sponge.

Customize Mugs: These sublimation mugs blank are customized for various DIY creativities, you can print anything on it through heat press! Perfect for creating photo mugs, promotions, gifts, personal keepsakes, artwork showcasing, and any creative job you may want with your wrap heat press machine.

Please note: In order to ensure that the coating does not fade after repeated washing in the dishwasher, our cup uses AAA-level coating, which is thicker than ordinary coatings and requires a longer heat transfer time.